Thanks, everyone, for your help testing the mods
Ok, I don't think twrp version has much to do with the issues. I'm not using the very newest (I'm on v2440) and I have yet to have a "disappearing" mms issue. But by all means, try anything.
Those having issues can also try to install by renaming their current mms apk to something like Secmms.old and pulling Secmms.apk out of the zip and place it in the system/app folder manually and fixing permissions.
I've been able to install on Metro v120 and v110 and both worked well.
I've also managed to install it on #2 v103.
Seems Metropolis plays best with the mod, perhaps because its closest to stock than other roms...maybe?
Oh, and thanks for testing the mod on other roms peeps. I appreciate your feedback